Never mind. Actually g_touch_keyboard_enabled is used, and we can't remove this flag.

Can we merge g_touch_keyboard_enabled and g_requested_keyboard_state?

I don't think it's immediately possible.

They represents different kind of infomation. g_touch_keyboard_enabled represents if touch view mode (aka maximized mode) is enabled.

g_requested_keybaord_state is for virtualKeyboardPrivate.setKeyboardState, so that priviledged apps can toggle virtual keyboard.
hotrod uses the API.
(https://cs.corp.google.com/piper///depot/google3/videoconf/gvc/hotrodapp/application/core/virtualkeyboardhandler.js?type=cs&q=setKeyboardState+file:%5C.js&sq=package:piper+file://depot/google3+-file:google3/obsolete&rcl=151401539&l=85)

Oops, I mistakenly deleted the comment 4. So sorry.
Fortunately the comment is just thank you by Hanada-san.